Control means for the impression rollers of duplicating machines



May 23, 1944.

M. P. NEAL CONTROL MEANS FOR THE IMPRESSION ROLLERS OF DUPLICATING MACHINES Original Filed April 7, 1939 2 Sheets-Sheet 1 May 23, 1944. M. P. NEAL CONTROL MEANS FOR THE IMPRESSION ROLLERS 0F DUPLIGATING MACHINES Original Filed April '7, 1939 2 Sheets-Sheet 2 Patented May 23, 1944 CONTROL MEANS FOR THE IMPRESSION ROLLERS OF DUPLICATING MACHINES Morris P. Neal, Quincy, Ill., assignor to Ditto, In-

corporated, Chicago, Ill., a corporation of West Virginia Original application April 7, 1939, Serial No. 266,518. Divided and this application October 25, 1941, Serial No. 416,543

3 Claims.

My invention relates to duplicating apparatus and particularly to an improved form of blackrestricted to use in connection with this type of machine, so far as they are applicable to other types of machines.

It is the object of this invention to provide an improved form and arrangement of operating and control parts in a machine of this type whereby the operator is enabled easily and quickly to throw the impression roller out of operative pressure relationship with the drum, this result being attained preferably without stopping the rotation of the drum. In my improved arrangement, I have provided a hand lever by a stroke of which the impression roller is moved out of engagement with the drum, the sheet feeding means is silenced, and the roller by which the ink is applied to the master sheet is moved outwardly so as not to engage the master sheet. The arrangement is such that upon a reverse stroke of the hand lever the parts are restored to their operative positions.

For carrying out these objects, the impression roller is supported by a yoke which is pivotally mounted below the drum, means being provided for limiting the upward movement of the impression roller toward the drum, and spring means being provided for applying yielding pressure upwardly on the impression roller for pressing the roller firmly against the portion of the drum which it is designed to engage. `Means is provided .in connection with the hand lever whereby a downward stroke of the lever causes the yoke to swing downwardly for carrying the impression roller downwardly against the action of said spring means out of position for engagement with the drum.

It is another object of this invention to improve devices of this type in sundry details hereinafter pointed out. The preferred means by which the several objects have been attained are illustrated in the accompanying drawings, in which Fig. 1 is a vertical sectional view through a duplicating machine embodying my improved construction, with the upper part of the machine broken away and with parts omitted for clearness of illustration;

of the parts in changed position and with additional parts omitted;

Fig. 3 is a top plan view of the impression roller and its supporting and adjusting means, some of the supporting frame parts being shown in section; and

Figs. 4, 5 and 6 are vertical sectional views taken substantially at the line 4 4, the line 5 5, and the line 6 6, respectively, of Fig. 3.

This application is being led as a division of my earlier application Serial No. 266,518, iiled April 7, 1939, to which reference may be-had for a more complete understanding of the machine and an appreciation of the relation of the invention covered by this application to the construction and operation of the machine as a whole.

Referring now to the several gures 'of the drawings, in which corresponding parts are indicated by the same reference characters, I0 in dicates the framework of the machine for supporting a drum rotatably in position. In the arrangement shown, the drum comprises two sections II and I2, which are rigidly connected together by any suitable means so as to provide openings in the wall of the drum at opposite sides thereof. The drum section Il is provided with a master sheet I3 wrapped thereabout and secured thereon by any suitable mechanism, not shown. The drum section I2 is provided with an ink pad I4 wrapped thereabout and secured also by any suitable means. The drum section II is of slightly greater diametrical size than that of the section I2. A large gear I5 is connected with the drum at one end portion for driving it in counterclock'wise direction in Figs. 1 and 2 from any suitable source of power. comprising the sections II and I2, I have provided a platen or impression roller I6 mounted so as to be movable toward' and from the drum. In the arrangement illustrated, the impression roller I6 is rotatably mounted upon two arms I1 which in turn are pivotally mounted at I8 so as to be adapted to swing vertically toward and from the drum. At the rear end portions, the arms I1 are connected by a transversely extending cross-bai` I9 which is formed integrally with the arms I1 so as to give the structure as a whole the form of a yoke.

As is best shown in Fig. 4, the cross-bar I9 of the yoke structure is connected by means of a link 20 with a cross-bar 2I which is secured at its end to suitable portions of the framework IU. The link 20 extends through an opening in the vbar 2|, with nuts 22 secured by means of screw Fig. 2 is a view similar to Fig. 1 but with some 56 threads on its lower end below the bar 2| so as Below the drum tion of the plungers with respect to the bar.

to be adjustable for controlling the height to which the cross-bar l! is movable. Bars or plungers 2l are also slidably mounted in the cross-bar 2l with nuts 24 adjustably secured on their lower ends for adjusting the vertical their upper ends, the plungers i2l are provided with notched blocks 28 which engage the lower edge of the cross-bar I of the yoke, coil springs 28 being mounted upon the plungers for holding them normally in raised position with respect to the bar 2l. In the arrangement shown in Fig. 1, the springs 26 press the impression roller II nrmly against the master sheet Il carried by the drum section Ii.

The means provided for moving the arms i1 and the impression roller I0 downwardly against the action of the springs 26 comprises a long hand lever 21 which is flxedly mounted upon a rock shaft 28 extending across the machine from one side to the other, as is best shown in Fig. 3. At intermediate points therealong, the shaft .2l is provided with pins 2l projecting rearwardly therefrom into position to engage openings in brackets 3l extending downwardly from the cross-bar il of the yoke, the arrangement being such that when the lever 21 is moved downwardly from its normal position as shown in Fig. 1 to the changed position as shown in Fig. 2, the pins 2! are moved into changed angular position so as to carry the yoke and the impression roller li downwardly against the action of the springs 26 so as to carry the impression roller out of position for engagement with the drum section Il. A long coiled spring 3i connected with the .forward end of the lever 21 normally holds the lever in position as shown in Fig. 1.

The nuts 22 are normally adjusted in such position on the link 2l as to permit the impression roller II to have a pressure engagement with the drum section impression roller I0 out of engagementwith the ink pad Il carried by the drum section I2.

Means is provided for holding the lever 21 releasably in its lowered position as shown in `Fig. 2. This means comprises a latch device l2 pivot-ally mounted upon a plate portion I2 of the framework as shown in Figs. 3 and 5, a spring 3l being provided in conction with the latch device for holding it normally swung to the limit of its motion toward the left in' Fig. 5. The arrangement is such that when the lever 21 is moved downwardly, the latch device 82 is displaced toward the right so as to assume latching engagement with the lever. A pin II slidably mounted in a suitable portion of the framework N is adapted by engagement with the latch device )2 to move it toward the right out of engagement with the lever 21 so as to permit the lever 21 to be raised by the spring 2| whenever desired.

In the arrangement as shown in Figs. 1 and 2, a table 2i is provided adapted to hold a pile of copy sheets 31 in position to be fed forwardly by a roller Il which is mounted in position to engage the top sheet of the pile on the table. A tray l! is also shown in position in Fig. 1 a

Il but S0 as t0 hold the short distance in front of the impression roller li for receiving the copy sheets a'fter their passage between theA drum section il and the impression roller I6. Inasmuch as these parts form in and of themselves no part of the present invention, it is believed to be unnecessary to describe the parts or their operation more completely herein.

While the form and arrangement .of parts as shown and described are preferred, the invention is not to be limited to such construction except so far as the claims may be so limited, it being understood that changes might well be made in the construction without departing from the spirit of the invention.

I claim:

1. In a duplicating machine, the combination of a drum rotatably mounted in position, means for mounting a master sheet on the face of the drum, a heavy yoke member having its arms pivotally mounted below said drum, an impression roller journaled between the arms of said yoke in position to engage a master sheet on said drum, vertically positioned bars slidably mounted below said yoke member having notched heads engaging the crossbar portion of the yoke member, springs on sai'd bars normally urging them upwardly for pressing the impression roller against the drum, and nuts adiustably mounted on said bars for limiting the upward movement of said impression roller by said springs.

2. In a duplicating machine; the combination of a drum rotatably mounted in position, means for mounting a master sheet on the face of the drum, a heavy yoke member having its arms pivotally mounted below the drum, an impression roller journaled betwen the arms of said yoke in position to engage a master sheet onsaid drum, means comprising springs adapted by engagement with said yoke member normally to hold said impression roller in pressure relationship to said drum, movably mounted pins operatively engaging the crossbar portion of said yoke, and means for moving said pins so as to force said impression roller outwardly away from the drum against the action of said springs.

v3. In a duplicating machine, the combination of a drum rotatably mounted in position, means for mounting a master sheet on the face of the drum, a heavy yoke member having its arms pivotally mounted below the drum, an impression roller journaled between the arms of said yoke in position to engage a master sheet on said drum, means comprising springs adapted by engagement with said yoke member normally to hold said impression roller in pressure relationship to said drum, a rock shaft journaled in position adjacent to said impression roller, pins carried by said rock shaft adapted upon a rotary movement of the shaft in one direction to apply pressure on the crossbar portion of said yoke for moving said impressionroller out of pressure relationship with the drum, and a lever ilxedly mounted on said rock shaft for giving the rock shaft an operative stroke.

MORRIS P. NEAL. 

